Spring Seats .510 ID (16) For RPM Duals Valve Spring Locator - Inside - 0.030 in Thick - 1.270 in OD - 0.510 in ID - 0.680 in Spring ID - Chromoly - Set of 16

Spring Seats .575 ID (16) Valve Spring Locator - Inside - 0.060 in Thick - 1.270 in OD - 0.575 in ID - 0.615 in Spring ID - Chromoly - Set of 16

1.535 Spring Cups - .570 ID Valve Spring Locator - Inside - 0.062 in Thick - 1.535 in OD - 0.570 in ID - 0.720 in Spring ID - Steel - Black Oxide - Set of 16

1.324 Dual Valve Springs - RPM Series (16) Valve Spring - RPM Series - Dual Spring - 500 lb/in Spring Rate - 1.000 in Coil Bind - 1.324 in OD - GM LS-Series - Set of 16

1.610 Spring Cups - .570 ID Valve Spring Locator - Inside - 0.062 in Thick - 1.610 in OD - 0.570 in ID - 0.720 in Spring ID - Steel - Black Oxide - Set of 16

1.304 Dual Valve Springs - RPM Series (16) Valve Spring - RPM Series - Dual Spring - 433 lb/in Spring Rate - 1.000 in Coil Bind - 1.304 in OD - GM LS-Series - Set of 16